21049131 has 8 divisors (see below), whose sum is σ = 29542720. Its totient is φ = 13294152.

The previous prime is 21049121. The next prime is 21049141. The reversal of 21049131 is 13194012.

It is an interprime number because it is at equal distance from previous prime (21049121) and next prime (21049141).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21049131 - 2²³ = 12660523 is a prime.

It is a super-2 number, since 2×21049131² = 886131831710322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21049098 and 21049107.

It is not an unprimeable number, because it can be changed into a prime (21049121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184585 + ... + 184698.

It is an arithmetic number, because the mean of its divisors is an integer number (3692840).

Almost surely, 2^21049131 is an apocalyptic number.

21049131 is a deficient number, since it is larger than the sum of its proper divisors (8493589).

21049131 is a wasteful number, since it uses less digits than its factorization.

21049131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369305.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21049131 is about 4587.9331948057. The cubic root of 21049131 is about 276.1074067369.

The spelling of 21049131 in words is "twenty-one million, forty-nine thousand, one hundred thirty-one".